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Infiniti G35 (V35). Manual - part 333

DTC P0101 MAF SENSOR

EC-213

CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between MAF sensor terminal 3 and ECM terminal 67.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 7.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 8.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to

EC-226, "Component Inspection"

OK or NG

>> GO TO 9.

>> Replace intake air temperature sensor.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-442, "Component Inspection"

OK or NG

>> GO TO 10.

>> Replace EVAP control system pressure sensor.

10.

CHECK MASS AIR FLOW SENSOR

Refer to

EC-213, "Component Inspection"

OK or NG

>> GO TO 11.

>> Replace MAF sensor.

11.

CHECK INTERMITTENT INCIDENT

Refer to

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

>> INSPECTION END

Component Inspection

NBS000P3

MASS AIR FLOW SENSOR

With CONSULT-II

Reconnect all harness connectors disconnected.

Start engine and warm it up to normal operating temperature.

Connect CONSULT-II and select “DATA MONITOR” mode.

Continuity should exist.

EC-214

DTC P0101 MAF SENSOR

Select “MAS A/F SE-B1” and check indication under the follow-
ing conditions.

*: Check for linear voltage rise in response to engine being increased to about
4,000 rpm.

If the voltage is out of specification, proceed the following.

Check for the cause of uneven air flow through mass air flow sensor. Refer to following.

●

Crushed air ducts

●

Malfunctioning seal of air cleaner element

●

Uneven dirt of air cleaner element

●

Improper specification of intake air system parts

If NG, repair or replace malfunctioning part and perform step 2 to 4 again.
If OK, go to next step.

Turn ignition switch OFF.

Disconnect mass air flow sensor harness connector and reconnect it again.

Perform step 2 to 4 again.

If NG, clean or replace mass air flow sensor.

Without CONSULT-II

Reconnect all harness connectors disconnected.

Start engine and warm it up to normal operating temperature.

Check voltage between ECM terminal 51 (Mass air flow sensor
signal) and ground.

*: Check for linear voltage rise in response to engine being increased to about
4,000 rpm.

If the voltage is out of specification, proceed the following.

Check for the cause of uneven air flow through mass air flow sensor. Refer to following.

●

Crushed air ducts

●

Malfunctioning seal of air cleaner element

●

Uneven dirt of air cleaner element

●

Improper specification of intake air system parts

If NG, repair or replace malfunctioning part and perform step 2 and 3 again.
If OK, go to next step.

Turn ignition switch OFF.

Disconnect mass air flow sensor harness connector and reconnect it again.

Perform step 2 and 3 again.

If NG, clean or replace mass air flow sensor.

Condition

MAS A/F SE-B1 (V)

Ignition switch ON (Engine stopped.)

Approx. 0.4

Idle (Engine is warmed-up to normal
operating temperature.)

0.9 - 1.2

2,500 rpm (Engine is warmed-up to
normal operating temperature.)

1.5 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

SEF178Y

Condition

Voltage V

Ignition switch ON (Engine stopped.)

Approx. 0.4

Idle (Engine is warmed-up to normal
operating temperature.)

0.9 - 1.2

2,500 rpm (Engine is warmed-up to
normal operating temperature.)

1.5 - 1.9

Idle to about 4,000 rpm

0.9 - 1.2 to Approx. 2.4*

PBIB1106E

DTC P0101 MAF SENSOR

EC-215

Removal and Installation

NBS000P4

MASS AIR FLOW SENSOR

Refer to

EM-16, "AIR CLEANER AND AIR DUCT"

EC-216

DTC P0102, P0103 MAF SENSOR

PFP:22680

Component Description

NBS000P5

The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor controls the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.

CONSULT-II Reference Value in Data Monitor Mode

NBS000P6

Specification data are reference values.

On Board Diagnosis Logic

NBS000P7

These self-diagnoses have the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

PBIB1604E

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

See

EC-141, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

CAL/LD VALUE

●

Engine: After warming up

●

Shift lever: P or N (A/T), Neutral
(M/T)

●

Air conditioner switch: OFF

●

No load

Idle

5% - 35%

2,500 rpm

5% - 35%

MASS AIRFLOW

●

Engine: After warming up

●

Shift lever: P or N (A/T), Neutral
(M/T)

●

Air conditioner switch: OFF

●

No load

Idle

2.0 - 6.0 g·m/s

2,500 rpm

7.0 - 20.0 g·m/s

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

P0102
0102

Mass air flow sensor
circuit low input

An excessively low voltage from the sensor is
sent to ECM.

●

Harness or connectors
(The sensor circuit is open or shorted.)

●

Intake air leaks

●

Mass air flow sensor

P0103
0103

Mass air flow sensor
circuit high input

An excessively high voltage from the sensor is
sent to ECM.

●

Harness or connectors
(The sensor circuit is open or shorted.)

●

Mass air flow sensor

Detected items

Engine operating condition in fail-safe mode

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

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